Rotary engine.



PATENTBD 'MAY 26, 1903.

No. 729,399. P.. A. PALLE. ROTARTENGINE.

APPLIOA'IION'FILED OUT. 20, 1902.

no MODEL. 2 SHEETS- SHEET WITNESSES: I v INVENTOB v Fade/12' IJWQ'IZMZY' PatentedMay 26, 1903.

OFFICE.

FREDERIO ALBERT PALLE; OF NEW YORK, N. Y.

ROTARY ENG IN E.

SPECIFICATION forming part of Letters Patent No. 729,399, dated May 26, 1903.

' Application filed October 30,1902 Serial No. 122,004. (No model.)

T0 at whom it may concern:

Be it known that I, FREDERIC ALBERT PALLE, a citizen of France, and a resident of the city of New York, borough of Manhattan,

in the county and State of New York, haveinvented a new and Improved Rotary Engine, of which the following is a full, clear, and exact description.

The object of the invention is to provide a and parts and combinations of the same, as

will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a cross-section of the improvement. Fig. 2 is aside elevation of the same, parts being broken out. Fig. 3 is a perspective view of the rotary piston and its slidable piston-heads. Fig. at is a sectional perspective view of the piston and its shaft, and Fig. 5 is a perspective view of one of the pistonheads. 7

The cylinder A of the rotary engine is mounted on a suitably-constructed base B, and in the cylinder is mounted to turn a piston having a cylindrical body'O,-secured on the main shaft D, journaled' in suitable bearings carried by the cylinder-heads. The main shaft D is connected outside of the cylinder E by belts or other devices with the machinery to be driven. Theinner surface of the cylinder A is formed by the concentric cylindrical segments A A located diametrically opposite each other and of different lengths, as will be readily understood by reference to Fig. 1, and the said sections are connected with each other by cylinder-segments A A of the same radius, but eccentric to the concentric segments A A The axis of the main shaft D and that of the piston-body O coincides with the axis of the cylinder-segment A, and the peripheral face of the said piston-body O is in contact witlrthe said segment A. In the piston-body C are held to slide radially the piston-heads 0, arranged in pairs diametrically and rigidly connected with each otherby cross-bars C and the said piston-heads are in contact at their outer ends with the inner surface of the cylinder A, as shown" in Fig. 1. The radius of each segment A A is equal to one-half of theaggregate sum of the radii of the segments A A and the sum of the radii is equal to the length of a pair of connected piston-heads, and hence the latter :are at all times in con tact withthe inner peripheral surface of the cylinder A.

Chambers F F are formed on opposite sides of the cylinder A and are connected by openings A A in the walls of the segments A A with the interior of the cylinder A, and the said chambers F F are also connected with the opposite sides of a valve-chamber A formed on the topof the cylinder A, as plainly shown in Figs. 1 and 2. In this valve-chamber A is mounted to turn a valve G, carrying at one outer end a handle H under the control of the operator, and the other end of the said valve is connected with the inlet-pipe I, leading to a suitable source of motive-agent supply. The valve G is adapted to connect the inlet-pipe I with'either chamber F F, and

the said-valve also serves to connect either chamber F F with the exhaust-pipe J, leading from the valve-chamberA? to a suitable place of discharge.

The cross-bars'C for each pair of pistonheads 0 are formed with elongated slots 0 for the passage of the main shaft D, and the said piston-heads are fitted to slide in slots 0 formed radially in the piston O, and the cross-bars C extend in recesses 0 formed in the faces of the piston C, so that the piston fits snugly in the cylinder A from one cylinder-head to the other, as will be readily understood byreference to Fig.2.

The operation is as follows: When the valve G is in the positionshown in Fig. 1, then steam or other motive agent can pass from the inlet-pipe I through the valve G into the direction of the arrow a. During the time a piston-head 0 travels in contact with the segment A the steam or other motive agent exerts its power on the said piston-head, and when the piston-head reaches the segment A and passes over the opening A then the pressure becomes equal on both sides of the piston-head, and hence no resistance is exerted on the said piston-head. The motive agent in the rear of this piston-head can now pass through the opening A into the chamber F and from the latter past the valve G into the exhaust-pipe J to be carried to the outside.

\rVhen it is desired to reverse the engine, it is only necessary for the operator to swing the lever l-I, so as to connect the inlet-pipe I with the chamber F and to connect the chamber F with the exhaust-pipe J. The abovedescribed operation is then repeated, the only difference being that the motive agent now exerts itself on the piston-headsin such a manner that the piston is turned in the reverse direction of the arrow a.

From the foregoing it will be seen that dur ing the time the piston-head passes the segment A there is no pressure whatever on this piston-head, and during the time a pistonhead passes over the openings A or A the pressure is equal on both sides of the pistonhead, so as to relieve the piston of undue back pressure during the time the pistonheads pass over the segments A A and A I do not limit myself to the number of slidable piston-heads employed, as the same may be variedthat is, increased or diminished in nu |nber-without deviating from the spirit or principle of my invention. I do not limit myself to the particular arrangement of steam (or other motive agent) inlet or outlet, as the same can be varied according to the motive agent used or the engine or when the engine is to be used as a pump or a blower.

The rotary engine described is composed of but few parts and is not likely to get out of order, and the engine can easily be reversed whenever it is desired to do so by the operator manipulating the lever H correspondingly.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A rotary engine comprising a cylinder having its innersurface formed of oppositelydisposed concentric segments of difierent lengths, and cylinder-segments eccentric to the said opposite concentric segments and connecting the latter with each other, said cylinder-segments being provided with elongated openings, inlet and exhaust chambers on the sides of the cylinder and connected with the interior of the cylinder by the openings in the walls of the eccentric connecting-segments, a valve-chamber at the top of the cylinder and with opposite sides of which the upper ends of the inlet and exhaust chambers connect, a valve in said chamber, and a piston mounted to turn in said cylinder concentric with the opposite segments and in contact with the smaller one of the said opposite segments, the said piston having diametrical slidable piston-heads in contact at their ends with the inner surface of the cylinder, as set forth.

2. A rotary engine comprising a cylinder having its inner surface formed of oppositelydisposed concentric segments of different lengths, and cylinder-segments eccentric to the said opposite concentric segments and connecting the latter with each other,said cylinder-segments being provided with elongated openings, inlet and exhaust chambers on the sides of the cylinder and connected with the interior of the cylinder by the openings in the walls of the eccentric connecting-segments, a piston mounted to turn in said cylinder concentric with the opposite segments and in contact with the smaller one of the said opposite segments, the said piston having diametrical slidable piston-heads in contact at their ends with the inner surface of the cylinder, a valve-chamber on top of the cylinder and with which the inlet and exhaust chambers connect, and -a rocking valve in said chamber for controlling the inlet and exhaust pipes of the motive agent to and from either the inlet or exhaust chamber, as set forth.

3. A rotary engine, comprising a cylinder having its inner surface formed of oppositelydisposed concentric segments of different lengths and cylinder-segments eccentric to the said opposite concentric segments and connecting the latter with each other, said cylinder-segments being provided with elongated openings, inlet and exhaust chambers on the sides of the said cylinder and connected with the interior thereof by the openings in the eccentric connecting-segments, and a piston mounted to turn in the said cylinder and having a cylindrical piston-body in contact with the smaller one of the opposite concentric segments, the said body having radial slots leading from its peripheral surface inwardly, and three pairs of piston-heads slidable in the radial slots, each pair of pistonheads being connected with each other by bars arranged on opposite sides of the piston and formed with elongated slots through which extends the piston-shaft, the outer end of the piston-heads being in contact with the inner surface of the cylinder, as set forth.

4. A rotary engine, comprising a cylinder havingits innersurface formed of oppositelydisposed concentric segments of different lengths and cylinder-segments eccentric to the said opposite concentric segments and connecting the latter with each other, said cylinder-segments being provided with elongated openings, inlet and exhaust chambers on the sides of the said cylinder and connected with the interior thereof by the openings in the eccentric connecting-segments, a piston mounted to turn in the said cylinder and hav- IOC each other by bars arranged on opposite sides of the piston and formed with elongated slots through which extends the piston-shaft, the outer ends of the piston-heads being in con-, tact with the inner surface of the cylinder, and the said connecting-bars extending in the recesses formed in the faces of the said piston-body, a Valve-chamber on top of the I 5 cylinder and with the opposite sides of which the inlet and exhaust chambers connect, and

.a valve in said chamber, as set forth.

In testimony whereof- I have signed my name to this specification in the presence of 20 two subscribing witnesses.

FREDERIO ALBERT PALLE.

WVitnesses:

THEo. G. HOSTER, EVERARD BOLTON MARSHALL. 

